we have obtained exclusive video of the 33-year-old, christopher jordan dorner, former lapd officer accused of killing three people. the video we are about to show you shows dorner when he was an lapd training cadet. you're going to see him training. this gives you a glimpse of who this man really is. "outfront" with this exclusive report. >> reporter: christopher dorner, lapd ka pet det, in 2005. >> what do you think watching this? considering what's happened? >> well, he's an expert with weapons, definitely. he's definitely dangerous. >> reporter: this man spent months with dorner at the lapd training academy. we are altering his voice and not showing his face because he fears dorner will go after his police friends. but he wants the public to see this so people understand what the lapd is facing. >> you look at chris, you can see he's a little bit of an expert. watch, he'll shoot, you -- almost no movement when he shoots the gun, and pop, nothing. >> he stood out? >> yeah, he stood out. he knew what he was doing. lapd, they're going to be going after one of their own former, and he knows